I agree with things that Håvard said. Very pleasurable to listen to. I wouldn't say that your 1st string (I assumed you meant the 1st instead of the 6th?) sounds terrible. It is a little thin sounding at some places. With Augustine Gold/Red/Blue/Black refers to the material and/or tension of the bass strings. The treble strings are differentiated by Classic / Imperial / Regal names. The Imperial is probably the thinnest sounding of those. Is that what you currently have? Imperial Gold?
I find many of the medium / lower tension 1st strings have the problem of sounding tinny. They usually sound fine for the first week, and then they start to sound thinner and thinner as the elasticity goes. I am currently using Hannabach 728 Custom Made Mediums. The trebles are very thick, the 3rd string a bit too thick for my taste, and because of the thickness the sustain suffers a bit, but with my setup / action, they're not overly hard for the left hand. Also, they do not sound overly exciting, but they seem very consistent to me. They stay in tune well, are not very sensitive for temperature (they don't get sharp after being played for a while), the intonation is perhaps not the absolute best, but still acceptable to me. And it's easy to maintain a good tone on the 1st string. I've had them on now for ~3 weeks, and they still sound good, which is more than I can say of most of the other strings I've tried, especially considering that I've been practicing considerably more this lesson than usually.
About your new recording room being too reflective, that is a matter of taste. I didn't find it excessively reflective, but if it forces you to place the microphone closer to the guitar than you're comfortable with, it may become a problem. Actually the sound in your recording was pretty much like my bedroom where I practice every now and then, but never record in. Because the room is smaller than my living room, I find that I play softer there and still get more volume. But regarding the tone, I think the bass strings are affected more.
To be honest, I'm surprised that you get as warm tone as you get by striking the strings as perpendicular as you do. Your right hand position is of the old 'Segovia school'. I guess you do sand & buff the undersides of your nails? After filing my nails, I get a catchy edge to the underside of my nails that I need to sand and buff away, because otherwise the tone will suffer. It's just difficult not to overdo, causing the nail's edge to become thin, which again worsens the tone.